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Share-based payments (Tables) | 12 Months Ended
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Dec. 31, 2018
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Abstract] |
Summary of Changes in Warrants |
|  |  | Weighted average exercise price |  |  | Number of warrants |  |  | Share-based reserve |
Balance at January 1, 2017 |  | $ | 0.24 |  |  |  | 45,885,172 |  |  | $ | 3,983 |
Exercise of warrants |  |  | 0.23 |  |  |  | (7,211,308 | ) |  |  | (619 | )
Expiry of warrants |  |  |  | 0.70 |  |  |  | (19,210 | ) |  |  | - |
Balance at December 31, 2017 |  |  | $ | 0.24 |  |  |  | 38,654,654 |  |  | $ | 3,364 |
Exercise of warrants |  |  | 0.14 |  |  |  | (13,114,336 | ) |  |  | (1,816 | )
Expiry of warrants |  |  | 0.08 |  |  |  | (82,695 | ) |  |  | - |
Balance at December 31, 2018 |  |  | $ | 0.26 |  |  |  | 25,457,623 |  |  | $ | 1,548 |
Summary of Outstanding Warrants |
Grant date | Expiry date |  | Number of warrants |  |  | Weighted average exercise price |
October 8, 2015 - October 28, 2015 | October 8, 2020 - October 28, 2020 |  |  | 4,586,785 |  |  | $ | 0.31 |
May 13, 2016 - May 27, 2016 | May 13, 2021 - May 27, 2021 |  |  | 20,870,838 |  |  |  | 0.25 |
|  |  |  |  |  |  |  |  | 25,457,623 |  |  | $ | 0.26 |
Summary of Changes in Options |
|  |  | Weighted average exercise price |  |  | Number of options |  |  | Share-based reserve |
Balance at January 1, 2017 |  | $ | 1.10 |  |  |  | 6,177,594 |  |  | $ | 735 |
Issuance of options |  |  | 2.82 |  |  |  | 6,402,000 |  |  |  | - |
Exercise of options |  |  | 1.03 |  |  |  | (571,246 | ) |  |  | (308 | )
Cancellation of options |  |  |  | 1.15 |  |  |  | (404,598 | ) |  |  | - |
Vesting of issued options |  | - |  |  |  | - |  |  |  | 1,862 |
Balance at December 31, 2017 |  | $ | 2.05 |  |  |  | 11,603,750 |  |  | $ | 2,289 |
Issuance of options |  |  | 8.23 |  |  |  | 1,910,000 |  |  |  | - |
Exercise of options |  |  | 1.41 |  |  |  | (597,379 | ) |  |  | (286 | )
Cancellation of options |  |  | 2.43 |  |  |  | (13,376 | ) |  |  | - |
Vesting of issued options |  |  | - |  |  |  | - |  |  |  | 4,238 |
Balance at December 31, 2018 |  | $ | 2.99 |  |  |  | 12,902,995 |  |  | $ | 6,241 |
Summary of Outstanding and Exercisable Options |
|  |  |  |  |  |  |  |  |  | Weighted average |
Grant date | Vesting terms | Expiry date |  | Number of options |  |  | Exercise price |  |  | Remaining contractual life (in years) |
August 5, 2016 | Evenly over 48 months | August 5, 2021 |  |  | 1,058,334 |  |  | $ | 0.50 |  |  |  | 2.60 |
October 6, 2016 | Evenly over 48 months | October 6, 2021 |  |  | 3,411,699 |  |  |  | 1.23 |  |  |  | 2.77 |
November 21, 2016 | Evenly over 48 months | November 21, 2021 |  |  | 182,000 |  |  |  | 1.84 |  |  |  | 2.89 |
April 12, 2017 | Evenly over 48 months | April 12, 2022 |  |  | 3,273,020 |  |  |  | 3.14 |  |  |  | 3.28 |
August 23, 2017 | Evenly over 48 months | August 23, 2022 |  |  | 2,872,941 |  |  |  | 2.42 |  |  |  | 3.65 |
November 9, 2017 | Evenly over 48 months | November 9, 2022 |  |  | 200,000 |  |  |  | 3.32 |  |  |  | 3.86 |
January 30, 2018 | Evenly over 48 months | January 30, 2023 |  |  | 275,001 |  |  |  | 8.40 |  |  |  | 4.08 |
January 31, 2018 | Evenly over 48 months | January 31, 2023 |  |  | 150,000 |  |  |  | 9.00 |  |  |  | 4.09 |
May 18, 2018 | Evenly over 48 months | May 18, 2023 |  |  | 1,195,000 |  |  |  | 7.57 |  |  |  | 4.38 |
June 28, 2018 | Evenly over 60 months | June 28, 2023 |  |  | 180,000 |  |  |  | 8.22 |  |  |  | 4.49 |
September 13, 2018 | Evenly over 48 months | September 13, 2025 |  |  | 25,000 |  |  |  | 14.70 |  |  |  | 6.71 |
October 12, 2018 | Evenly over 48 months | October 12, 2025 |  |  | 30,000 |  |  |  | 11.80 |  |  |  | 6.79 |
December 14, 2018 | Evenly over 20 quarters | December 14, 2025 |  |  | 50,000 |  |  |  | 15.29 |  |  |  | 6.96 |
Outstanding at December 31, 2018 |  |  | 12,902,995 |  |  | $ | 2.99 |  |  |  | 3.35 |
Exercisable at December 31, 2018 |  |  | 5,648,656 |  |  | $ | 2.28 |  |  |  | 3.14 |
Summary of Fair Value of Options | The fair value of the options issued during the year was determined using the Black-Scholes option pricing model, using the following inputs:
|  |  |  |  |  | 2018 |  |  | 2017 |
Share price at grant date (per share) | $7.57 - $15.29 |  |  | $2.42 - $3.27 |
Exercise price (per option) | $7.57 - $15.29 |  |  | $2.42 - $3.32 |
Risk-free interest rate | 1.93% - 2.45% |  |  | 0.96% - 1.59% |
Expected life of options (in years) | 5 - 7 |  |  | 5 |
Expected annualized volatility | 55% |  |  | 55% |
Expected dividend yield | 0% |  |  | 0% |
Weighted average Black-Scholes value at grant date (per option) | $4.09 |  |  | $1.39 |

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